EP 0717029 B1 19991013 - Process for a rectificative separation of (meth)acrylic acid from a hydrophobic mixture containing crude (meth)acrylic acid
Title (en)
Process for a rectificative separation of (meth)acrylic acid from a hydrophobic mixture containing crude (meth)acrylic acid
Title (de)
Verfahren der rektifikativen Abtrennung von (Meth)acrylsäure aus einem hydrophobe Roh(meth)acrylsäure enthaltenden Gemisch
Title (fr)
Procédé de séparation rectificative d'acide (méth)acrylique à partir d'un mélange hydrophobe contenant de l'acide (méth)acrylique brut
Publication
Application
Priority
US 35589294 A 19941214
Abstract (en)
[origin: EP0717029A2] A process for the sepn. of (meth)acrylic acid (I) from a mixt. contg. (a) (I), (b) inert, hydrophobic organic liq. with a higher b.pt. than (I) as main component and (c) lower aldehydes as minor components, comprises rectification with the addn. of a prim. amine and/or salts thereof (II). Also claimed are processes for the prodn. of (I) by gas-phase oxidn. of a 3C/4C starting material (III). Pref. liq. (b) contains diphenyl ether (DPE), and pref. comprises a mixt. of 70-75 wt.% DPE and 25-30 wt.% biphenyl contg. 0.1-25 wt.% (w.r.t. the mixt.) of dimethyl o-phthalate. Amine (II) is a hydrazine deriv., pref. the hydrazide of a carboxylic acid, esp. pref. adipic acid dihydrazide.
IPC 1-7
IPC 8 full level
C07C 51/44 (2006.01); C07C 51/46 (2006.01); C07C 57/055 (2006.01); C07C 57/07 (2006.01); C07C 57/075 (2006.01)
CPC (source: EP KR US)
C07C 51/42 (2013.01 - KR); C07C 51/44 (2013.01 - EP US); Y10S 203/22 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE DK ES FR GB IT NL
DOCDB simple family (publication)
EP 0717029 A2 19960619; EP 0717029 A3 19960918; EP 0717029 B1 19991013; CA 2164556 A1 19960615; CN 1121372 C 20030917; CN 1136553 A 19961127; CZ 329195 A3 19960717; DE 59507043 D1 19991118; JP H08208557 A 19960813; KR 960022433 A 19960718; MY 116006 A 20031031; SG 52746 A1 19980928; TW 324715 B 19980111; US 5961790 A 19991005; US 6228227 B1 20010508
DOCDB simple family (application)
EP 95118901 A 19951201; CA 2164556 A 19951206; CN 95121673 A 19951214; CZ 329195 A 19951213; DE 59507043 T 19951201; JP 32196895 A 19951211; KR 19950049568 A 19951214; MY PI19953812 A 19951209; SG 1996008741 A 19951201; TW 84113082 A 19951208; US 27501699 A 19990324; US 35589294 A 19941214